Pulp-beating engine.



PATENTED SEPT. 20, 1904.

J. M. MILLER. PULP BEATING ENGINE.

APPLICATION IILED FEB. 10, 1904.

N0 MODEL.

Wi tnEssEs JAMES M. MILLER UNITED STATES Patented September 20, 1904.

JAMES M. MILLER, OF HOOSICK FALLS, NEW YORK.

PULP-BEATING ENGINE.

SPECIFICATION forming part of Letters Patent No. 770,301, dated September 20, 1904,

Application filed February 10,1904. Serial No. 192,911. (No modem To all whom, it may concern.-

Be it known that 1, JAMES M. MILLER, of the village of Hoosick Falls, in the county of Rensselaer and State of New York, have invented certain Improvements in Pulp-Beating Engines; and I hereby declare that the subjoined description, in connection with the accompanying drawings, constitutes a specification thereof, and of the best method of construct-ing and operating the same.

This invention belongs to that class of pulpbeating engines in which a beating-roll is placed at each end of a long tub or vat, and the stuff being operated on is passed from end to end of the tub through separate but contiguous channels, each of which is so designed that it takes the stock as it is delivered from the top of one roll and carries and delivers it to the other roll at the bottom of the tub, whereby differential rates of velocity in the circulation of the stuff which are characteristic of the common oval tub with only one roll are avoided. The beds of these channels are so warped or twisted as to compel a thorough intermixture of the stuff as it passes over them, but offer no serious obstacle to the free and rapid circulation of the contents of the tub. p

The objects of the invention are to promote homogeneous mixture of the stock and its rapid circulation around the engine, whereby an increased output in obtained.

The invention is fully illustrated in the accompanying drawings, wherein Figure 1 exhibits a top plan view of the invention. Fig. 2 is a side elevation of the same, which also shows a partial vertical longitudi: nal section of the same, taken on the line A B C of Fig. 1. Fig. 3 is a diagonal vertical transverse section of the tub, taken on the line D E of Fig. 1.

My invention is embodied in a tub I, in each end of which is mounted in operative position abeating-roll 2 and bed-plates 3. These are of the ordinary construction. These rolls are covered with hoods 4:, to confine the flying material as the engine is operated. On the side of the roll toward the middle of the tub is an apron 5, which operates much as the ordinary backfall to receive the pulp from the roll.

Next to the roll this apron is fiat, and its receiving edge is parallel with the blades of the roll; but as it slopes toward the center of the tub it takes on a concave shape, as shown in cross-section in Fig. 3, the lowest part of the channel being one side of its center, as at b b, Fig. 1. Thus a twisting spiral form is given to the bottom of this apron designed to impart to the current running over it a diversion from its otherwise direct line of movement toward the opposite side of the channel. By these aprons the tub is horizontally divided into two channel-ways. The upper one is transversely divided by a diagonal midfeather 8, which forms one of the side walls to the channel of which the apron forms the bottom. The under channel is similarly diagonally divided by a partition 6, which runs transversely across the mid-feather 8. The front end of each apron rests upon the top of this partition, which is shaped, as seen at c in Fig. 2, to promote the easy and rapid flow of the pulp over it. Thus its upper edge acts as the brink of a dam to which the pulp is carried by the apron and over which it breaks and abruptly descends into the vortex below, formed between the side walls of the tub and the partition 6. In order not to obstruct the ready flow of the pulp from the apron through the'under channels, the walls of the tub are expanded, as seen at 12 12, so as practically to preserve the whole width of the apron-way down through to the entrance into the. under passage.

From the foregoing it will be seen that on each side of the tub at the middle where the two currents pass each other two sinks 7 and 10 are formed, into which the pulp from the aprons is poured and out of which there are openings under the mid-feather 8 into the under channel leading to the under side of the roll. In their action these sinks are in the nature of mixing-pools. This results from eddies set up therein due to the crossing of currents as the stuff is delivered thereto from opposite sides or from the center of the mouth of the apron 5. It will be seen from the indication of the feathered arrows that pulp from the right bank or side of the apron will be forced away from the mid-feather toward the opposite side and will pass into the vortex or pool-over the mouth of the apron with an impulse which will carry it toward the curb of the tub, while the pulp on the apron nearest and athwart of the current defined by the feathered arrows. Thus the contrary and conflicting currents and eddies set up in these sinks effect a very thorough intermixture of the stock before it passes to the rolls, and on each shift from one side of the tub to the other they are all reversed, whereby the most effective results are achieved.

1 therefore claim as new, and desire to se cure by Letters Patent, the following:

1. A pulp-beating engine having a beatingrolland bed-plate ateach end thereof, between which are two longitudinal pulp-channels the terminals of which are substantially of the full width of the rolls, each of which spirally enwraps the other witha half-twist, so that what is the upper current asthe pulp leaves one roll, by virtue of such half-twist in the channel, becomesithe under current when it reaches the other roll, substantially as specified.

2. A pulp-beating engine consisting ofa tub composed of two symmetrical half-sections, each half-section being provided with a beating-roll and bed-plates at the outer end thereof, a warped apron in each half-section which divides the same horizontally into an upperchannels, and means for preventing the intermingling of the currents of the two lower channels, substantially as specified.

3. A pulp-beating engine consisting of a vat or tub with a beating-roll and bed-plates at each end thereof, the space between the rolls being divided into two circulating-channels the terminals of which are substantially of the full width of the rolls for the pulp, each leading from the upper side of a roll at one end of the tub over an apron to a channel commencing substantially at the center ofand at the bottom of the tub, thence through said channel to the under side of the roll at the opposite end of the tub, substantially as specified.

4. A p u lp-beating-engine tub provided with a beating-roll and bed-plates .at each end, a diagonal mid-feather which bisects the upper part of the tub, a diagonal partition crossing the mid-feather which bisects the lower part of the tub, an inclined apron extending from each roll to the under partition :and breaking over the top of thelatteras a dam, saidapron bridging from the mid-feather to the opposite wall of the tub to form the bottom of achannel, substantially as specified.

.5. In the described tub the combination with the rolls thereof of the two lateral vertical mixing sinks or pools and a warped apron leading from each roll and discharging :into said sinks substantially in the manner described and for the purposes specified.

In testimony whereof I have hereunto subscribed my name in the presence of two witnesses.

JAMES M. 

